Electric-arc lamp.



No. 685,426. Patented out. 29, I90l.

- .1. A. m'osnsn.

ELECTRIC ARC LAMP.

(Application filed Mar. 25, 1901. (No Model.) 3 Sheets$heat I.

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Patented Oct. 29. l90l. J. A. MOSHER.

ELECTRIC ARC LAMP.

Application filed Mar. 25, 1901.)

3 Sheets-Sheet 2.

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(No Model.)

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No. 685,426. Patented Oct. 29, mm.

' .1. A. mosmzn.

ELECTRIC ARC LAMP.

' (Application filed Mar. 25, 1901.)

(No Model.) 4 3 Sheets-Sheot 3.

WIT/V555 I [1V VEN TOR. /Cfiofln y i figfji' (g. )n, Ma/(550d ATTORNEKUNITED STATES PATENT OFFICE.

JOHN A. MOSIIER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE ADAMS (h VESTLAKECOMPANY, A CORPORATION OF ILLINOIS.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 68 5,426, dated October29, 1901.

A fi tl filed March 25, 1901. Serial No. 52,859. (No model.)

To all whom it may concern:

Be it known that I, JOHN A. MOSHER, a citizen of the United States, anda resident of Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in Arc-Headlights, of whichthe following is a specification, and which are illustrated in theaccompanying drawings, forming a part thereof.

This invention relates to arc-headlights, particularly to such as areadapted for use on street-cars; and its objects are to adapt such alight for attachment back of the dashboard of a street-car and togenerally improve its construction, the invention consisting in thevarious parts and'arrangement of parts, as hereinafter fully describedand as illustrated in the accompanying drawings, in which- Figure 1 is afront elevation of the lamp as applied to the dashboard of a car. Fig. 2is a central vertical section of the same. Fig. 3 is a section on theline 3 3 of Fig. 2. Figs. 4., 5, 6, 7, 8, and 9 are details of the lamp,and Figs. 10, 11, and 12 are details of a modification of thebulb-holder.

A portion of the dashboard of a car is shown at 15 and is apertured, sothat the body of the lamp may be located back of it and the front of thelamp in front of it.

The body of the lamp consists of a generally-concave casting, as 16,having a ring 16, adapted to rest against the dashboard and surround itsaperture. The front portion of the lamp consists of a ring 17, adaptedto be appliedto the front of the dashboard and inclose its aperture andto carry the glass plate 18, the two rings 16 and 17 being secured together and to the dashboard by means of screw-bolts, such as 19.

The body 16 of the lamp is provided in its lower portion with a verticalsocket 20 for the lower carbon, and Within this socket there plays athreaded rod 21, having its upper end socketed and longitudinally split,as shown at 22, to provide a spring-clamp for holding the lower carbonThe rod 21 cooperates with the block 24:, fitting loosely within alateral aperture in the socket-block 20 and having its inner facecrossed by screw-threads and being carried by a leaf-spring 25, securedto the lamp-body 16. The screw-threads of the rod 21 and block 21 are ofsuch pitch that by the application of force the rod may be reciprocatedwithout being turned, the block 24. serving simply as means forfrictionally holding the rod, but its threads also admitting of theadjustment of the rod by turning. The rod is tubular in order to permitcarbondust and particles to drop therethrough, and its carbon-receivingsocket is formed by counterboring its aperture.

An upward tubular extension 20 of the lamp-body 16 is provided forreceiving the works of the lamp and is closed by a cap 26, havingsuitably-proteeted ventilating-apertures. A solenoid-coil 27 is woundupon a brass tube 28, forming the body of the spool, the head or endmembers of which are shown at 29 30. The coil is secured within theframe 31, held between an upper plate 31 and a lower plate 32, whichplates are socured together by the screw-rods 33, and the whole issupported by means of a bracket 34, secured to the rear wall of theextension 26 by means of screws, but insulated therefrom, as shown at35. The upper head or end 29 of the spool is provided with a centralannular projection 36, which extends partly through the solenoid-core,the lower end of its bore being flaring and on a long taper, thisprojection constituting a fixed portion of the solenoid-core and being,of course, of iron. The movable member 37 of the solenoid-core isalsotubular and has its upper end tapering to correspond with the taperof the bore of the member 36. A carbon-receiving tube 38, of brass,projects loosely through the two members of the solenoid-core and isprovided at its upper end with a collar 39, which plays within acounter-bore of the upper spool end 29, such counterbore and the plate31 defining the limits of its vertical movement.

To the lower end of the tube 38 there is fixed a block 40, which carriesan oscillating clutch 4-1, adapted to grip the upper carbon 42 and beingprovided with a crank-arm 43,

connected, by means of alink M, with a lug 45, formed upon the lowermember 37 of the solenoid core. Upward movement of this Ice member ofthe core locks the clutch 11, gripping the carbon 1-2 and binding itagainst the head 40, further movement of the core raising both thecarbon and the tube 38. The movable member of the solenoid-core, thetube 38, and carbon 42 will descend together until the collar 39 strikesthe bottom of the counterbore of the spool end 29. Further downwardmovement of the core will turn the clutch 41 and release the carbon,allowing it to fall.

Loosely playing within the tube 38 is a cap 46, longitudinally slottedto form the spring fingers 47, between which the carbon 42 may be forcedin trimming the lamp. The bore of the block 40 is somewhat less thanthat of the tube 38, so that the cap 46, while free to move within thelatter, will not pass through the former, thereby preventing the remnantof the carbon from falling entirelyout of the tube.

The current is led to the lamp through the wire 48, coming up from belowand passing through the lamp-body 16, being held by suitable clips 49and passing up into the lamp-head, where it is secured to a brass plate50, attached to but insulated from the frame 31, and to which plate oneend of the coil 27 is also electrically connected. The opposite end ofthe coil 27 is electrically connected with the tube 28, so that thecurrent will pass into the upper carbon and to the ground through thelower carbon, the lampbody, and the car.

The lamp is of the focused-arc type, and a diaphanous bulb 51 istherefore provided for inclosing the are, the upper end of the bulbbeing closed by a loose-fitting cap 52, through which the upper carbon42 is free to play, and its lower end resting upon the socketblock 20and being clamped by the springfingers 53 53, which are secured to thesides of the socket-block 20. Each of the springiingers 53 is providedwith two inwardlyextending projections 54 55, the projections 51 havingtheir outer faces beveled, so that in placing the bulb 51 its neck maysimply be forced in between them. A suitable concave reflector-plate 56is placed back of the arc and may be secured to the ring 16 of thelamp-body.

The glass front 18 of the lamp is carried by a ventilating-ringcomprising the two members 57 58, one within the other, the bodyportions of the two being spaced somewhat apart and each being radiallyperforated, as shown at 59 and 60, the perforations of the twoalternating, so that rain will not beat directly into the lamp-chamber.The apertures of the inner member 58 of the glass-holding ring aresurrounded by outstanding flanges 61, so that any wet finding its wayinto the chamber between these two bands will follow down the outersurface of the inner one and drip out through the apertures at thebottom of the outer one.

A hand-hole is formed in the dashboard below the lamp, as indicated at62, for con venience in trimming. This hole is preferably covercd by adoor 63, pivoted to the ring 17 and secured by a hand-controlled catch61. Preferably the ring 17 is provided with a downward extension forinclosing the handhole 62 and forming a seat for the door 63.

In trimming the lamp the rod 21 is entirely withdrawn and the lowercarbon titted within its socket. The upper carbon having been insertedthrough the socket-block 20, the lower carbon is now entered therein,being pushed upwardly until it forces the upper carbon into the cap 16,the lower carbon being now withdrawn by turning the rod 21 until thedescent of the upper carbon is arrested by the collar 39 reaching thebottom of the aperture within which it plays. lVhen the current isturned on, the movable member 37 of the solenoid core is drawn up,actuating the clutch 41, and thus binding the core member, the carbon,and the tube 38 together and drawing the arc. The carbon-feed isintermittent and caused by the rupture of the are by the too wideseparation of the carbon pencils. The current being thus interrupted,the uppercarbon, the tube 38, and the core member 37 instantly drop, thearrest of the tube 38 by the agency of the collar 39 causing the releaseof the clutch, so that there is a slight downward feeding of the carbonrelatively as to its containing-tube. The current being againestablished,the are is instantly redrawn, and the whole operation offeeding the carbon has taken place in such a short time that theinterruption of the light is scarcely noticeable.

The construction of the lamp-head is especially convenient for thepurpose of repairs. By loosening the bolts which pass through the topplate 31 the latter, together with the works of the lamp, maybe liftedout without necessitating the disconnecting ot' the lampbody from thedashboard.

In lieu of the spring-fingers 53 for holding the diaphanous bulb 51 Imay use a fixed plate 0%, having a pair of inturned projections forengaging the bulb, and a movable plate 65. The latter plate is securedloosely to the socket-block 20 by a staple or similar device, settingthrough a suitable aperture in the plate and fixed in the socketblock,and by a wing-nut 68, applied to a threaded stud 67, fixed in thesocket-block and projecting through a suitable aperture in the plate 65.This latter plate is also provided with inturned projections forengaging the bulb 51, and the latter is placed by first turning back thenut 68 to release the plate and then turning the nut up to force theplate against the bulb. The projections of the two plates aresufficiently resilient to compensate for any expansion and contractionof the bulb due to heat. In this last-described modification the nut andbolt constitute the means for clamping the bulb, while in the IIOpreviously-described form of bulb-securing mechanism the spring-fingers53 provide the clamping pressure.

I claim as my invention 1. In an electric-arc headlight, in combination,a car-dashboard having an aperture, and alamp comprising two sectionsone of which contains the works of the lamp and the other, or front, theglass, the two sections being secured together upon and to the oppositefaces of the dashboard and around the aperture.

2. In an electric-arc lamp, in combination, a socket-block for receivinga carbon pencil, adiaphanous bulb for inclosing the arc, yieldingclamping-fingers secured to the socketblock and projecting upwardly andhaving inturned projections for engaging the bulb, and a screw forforcing the fingers into engagement with the bulb.

3. In an electric-arc headlight, in combination, a lamp casing having apassage through the wall thereof, a threaded carbonholder adapted toreciprocate in the passage, and a threaded friction-block held inengagement with the threads of the carbon-holder to provide for a screwadjustment of the same, the threads of the blockand carbon-holder beinginclined on both sides.

4. In an electric-arc headlight, in combination, a lamp-body having asocket through the wall thereof, a threaded carbon holder adapted toreciprocate in the socket, a threaded friction-block, and a spring forholding the block in engagement with the holder to provide for a screwadjustment of the same, but allowing the block to yield in order topermil] of the reciprocation of the holder without turnin 5. In anelectric-arc headlight, in combination, a lamp-body having a socketthrough the wall thereof, a threaded carbon-holder adapted toreciprocate in the socket and having its upper end provided withspringfingers for grasping the carbon, a threaded block engaging thethreads of the carbon-holder, and a spring for holding the block inengagement with the threads of the holder, in order to provide for ascrew'ad j ustment of the same, but allowing the block to yield topermit of the reciprocation of the holder without turnin 6. In anelectric-arc headlight, in combination, a lamp-body, a support withinthe body, a diaphanous bulb carried by the support and into whichproject the conductingcarbons, and a pair of spring-fingers carried bythe support and having inturned projections at their upper ends forengaging the bulb, two of the oppositely-disposed projections beingbeveled to permit the bulb to be forced past them.

7. In an electric-arc headlight, in combination, a lamp-body, a supportwithin the body, a diaphanous bulb carried by the sup port and having acontracted portion, and a pair of spring-fingers for holding the bulbsecured to the lamp-support and each of which is provided withinwardly-extending projections, one pair of the projections having theirouter faces beveled so as to permit of the ready insertion of thelamp-bulb.

8. In an electric-arc headlight, in combination, a lamp-body, adiaphauous bulb having openings through which the conductingcarbonsproject, a support for the bulb having an aperture for the passage ofthe lower carbon, a pair of spring-lingers secured to the support andhaving projections for engaging the bulb to hold the same in position,two of the projections having their outerfaces beveled to permit of theready insertion of the bulb, and a cap for the upper opening of the bulbhaving an aperture through which the upper carbon passes.

9. In an electric-arc headlight, in combination, a solenoid the top ofwhich is counterbored, a tubular movable core working in the solenoidand through which projects loosely a carbon-receiving tube havinglongitudinal movement relatively as to the core, and means operated bythe movable core for feeding the carbon, the receiving-tube having acollar adapted to playin the eounterbore in the solenoid to limit themovement of the receivingtube.

10. In an electric-arc headlight, in combination, a solenoid, the spoolof which is provided with a counterbore, a plate closing thecounterbore, a movable core working in the solenoid, a carbon-receivingtube, a clutch, and means actuated by the movable core for operating theclutch to advance and retract the carbon-receiving tube, thereceiving-tube having a collar adapted to play in the counterbore in thesolenoid-spool and its move ment being limited by the counterboro andthe plate closing the same.

11, In an electric'arc headlight, in combi nation, a lamp-body having atubular exten" sion, a frame for carrying the works of the lamp, abracket to which the frame is removably secured, and a removable cap forthe tubular extension.

12. In an eleotric-arc headlight, in combi nation,a solenoid/the spoolof which is counter bored, a cap closing the oounterbore, a movabletubular core working in the solenoid, a carbon-receiving tube, a clutchcarried by the receiving-tube adapted to grip the carbon pencil, and aconnection between the clutch and the movable core, the receiving tubebeing provided with a collar adapted to play between the counterbore andthe plate closing the same, to limit the movement of the receiv ing-tubeand thereby, through the connection, the movable core,

13. In an electric-arc headlight, in combi nation, a lamp-body having atubular extension, a frame, a solenoid located within and acarbon-receiving tube carried by the frame,- a bracket for the frame,and a removable cap for the tubular extension, the frame being removablysecuredin place to permit of the removal of the works of the lampthrough the extension.

14:. In an electric-arc headlight, in combination, a lamp-body, havingan upward tubular extension, a frame disposed within the extension, asolenoid located within and a carbon-receiving tube carried by theframe, and a bracket for the frame secured to but insulated. from thebody of the lamp, the frame being removably secured in place to permitof the removal of the works of the lamp.

15. In an electric-arc headlight, in combination, a lamp-body having anupward tubular extension, a frame consisting of a top and bottom and twoside members, and disposed within the extensioma solenoid located withinand a carbon-receiving tube carried by the frame, a bracket for theframe secured to but insulated from the body of the lamp, and a platecarried by but insulated from one of the side members of the framethrough which the current is conducted to the one end of thesolenoid-core, the other end of the coil being connected to the spool ofthe solenoid to conduct-the current to the carbon pencil.

16. In an electric-arc headlight, in combination, a solenoid, acarbon-receiving tube, means operated by the solenoid for feeding thecarbon, and a cap secured to the end of the carbon and adapted toprevent the remnant of the carbon from falling out of the tube.

17. In an electric-arc headlight, in combination, a solenoid, acarbon-receiving tube having a contracted outlet, means operated by thesolenoid for feeding the carbon, and a cap having spring-fingers bywhich it is secured to the end of the carbon, the cap engaging thecontracted end of the receivingtube to prevent the remnant of the carbonfrom falling entirely therefrom.

18. In a headlight having a glazed lightemitting aperture, aventilating-ring surrounding such aperture and consisting of an outerand an inner perforated member, the perforations of the two membersbeing out of alinement, and those in the upper portion of the innermember being surrounded by upstanding flanges, and those in the lowerportion of the outer member being Without upstanding flanges and servingas drainageopenings.

19. In an electric-arc headlight, in combination, a solenoid, a tubularmovable core playing therein, a carbon-receiving tube projecting throughthe core, an oscillating clutch carried by the receiving-tube andadapted to grip the upper carbon of the lamp, a crankarm secured to theclutch, a link connecting the crank-arm with the movable core, and meansfor limiting the movement of the receiving-tube, the travel of the corebeinggoverned by that of the receiving-tube but is allowed a greaterplay in order to permit of the operation of the clutch.

JOHN A. MOSIIER.

Witnesses:

ARTHUR B. SEIBOLD, E. M. KLATCHER.

